NORTON SHORES, MI – Donations toward a $15,000 reward for information on the apparent abduction of Jessica Heeringa are still being collected at the Norton Shores Police Department, four months after the Muskegon woman disappeared.

More importantly, information about where the young mother is today is also being sought and police are urging the public to assist with information.

The 26-year-old Exxon gas station clerk was allegedly abducted while finishing her night shift at the Sternberg Road station in Norton Shores on April 26.

Norton Shores Police Department officials released this photo of the type of van allegedly involved in the abduction of Jessica Heeringa. The image was sent out with a press release on Aug. 26 -- four months to the day Heeringa went missing.Norton Shores Police Department

Police believe she was taken against her will by someone she likely knew and transported away in a van a witness apparently saw in the area at the time.

Thousands of tips have come in since her disappearance, but police say the case remains unsolved today, Aug. 27, with very little solid information to go on.

“The police department is requesting help from anyone who may know something about this abduction,” authorities said in a press release.

"The Norton Shores Police Department continues to actively investigate Jessica's abduction on a daily basis. We would like the community to remember that Jessica is still missing and know that we need information directly connected to her abduction," he said.

"Though we continue to receive 30-50 calls per week, most of the information is speculative in nature and not based on direct knowledge of the events of April 26, 2013. As I've stated from the start of this investigation, we believe that someone has personal knowledge of who abducted Jessica and/or her whereabouts. We need those people to come forward, so we can bring her home to her family."

The reward is up to $15,160, police said, and donations are being accepted to add to that amount.

Donations should be made by check or money order to the Muskegon Community Foundation, C/O Silent Observer, and dropped off or mailed to the Norton Shores Police Department at 4814 S. Henry.

Donations can be made directly to Silent Observer or if you would like your donation returned if not used, mark “Reward for Jessica,” the press release stated.

Authorities are urging the public to come forward with any useful information.

Heeringa is described as a white female, 5 feet 1 inch tall, about 110 pounds, with blond, shoulder-length hair and blue eyes. Heeringa is also known to wear wire-rim glasses. She was last wearing a blue collared shirt with "Sternberg Exxon" on it, police have said.

Authorities said a witness saw a silver minivan -- possibly a 2005 Chrysler Town & Country -- in the area around the time Heeringa was reported missing.

Authorities describe the driver of that vehicle as a 6-foot-tall white man who appears to be 30 to 40 years old. He has a medium to heavy build with broad shoulders, light brown or sandy blond, wavy hair with a part in the middle with hair slightly longer on top.